1 /*
2 +----------------------------------------------------------------------+
3 | Copyright (c) The PHP Group |
4 +----------------------------------------------------------------------+
5 | This source file is subject to version 3.01 of the PHP license, |
6 | that is bundled with this package in the file LICENSE, and is |
7 | available through the world-wide-web at the following url: |
8 | https://www.php.net/license/3_01.txt |
9 | If you did not receive a copy of the PHP license and are unable to |
10 | obtain it through the world-wide-web, please send a note to |
11 | license@php.net so we can mail you a copy immediately. |
12 +----------------------------------------------------------------------+
13 | Authors: Christian Stocker <chregu@php.net> |
14 | Rob Richards <rrichards@php.net> |
15 +----------------------------------------------------------------------+
16 */
17
18 #ifdef HAVE_CONFIG_H
19 #include "config.h"
20 #endif
21
22 #include "php.h"
23 #if defined(HAVE_LIBXML) && defined(HAVE_DOM)
24 #include "php_dom.h"
25 #include "nodelist.h"
26 #include "zend_interfaces.h"
27
28 /*
29 * class DOMNodeList
30 *
31 * URL: https://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030226/DOM3-Core.html#ID-536297177
32 * Since:
33 */
34
objmap_cache_release_cached_obj(dom_nnodemap_object * objmap)35 static zend_always_inline void objmap_cache_release_cached_obj(dom_nnodemap_object *objmap)
36 {
37 if (objmap->cached_obj) {
38 /* Since the DOM is a tree there can be no cycles. */
39 if (GC_DELREF(&objmap->cached_obj->std) == 0) {
40 zend_objects_store_del(&objmap->cached_obj->std);
41 }
42 objmap->cached_obj = NULL;
43 objmap->cached_obj_index = 0;
44 }
45 }
46
reset_objmap_cache(dom_nnodemap_object * objmap)47 static zend_always_inline void reset_objmap_cache(dom_nnodemap_object *objmap)
48 {
49 objmap_cache_release_cached_obj(objmap);
50 objmap->cached_length = -1;
51 }
52
dom_nodelist_iter_start_first_child(xmlNodePtr nodep)53 static xmlNodePtr dom_nodelist_iter_start_first_child(xmlNodePtr nodep)
54 {
55 if (nodep->type == XML_ENTITY_REF_NODE) {
56 /* See entityreference.c */
57 dom_entity_reference_fetch_and_sync_declaration(nodep);
58 }
59
60 return nodep->children;
61 }
62
php_dom_get_nodelist_length(dom_object * obj)63 zend_long php_dom_get_nodelist_length(dom_object *obj)
64 {
65 dom_nnodemap_object *objmap = (dom_nnodemap_object *) obj->ptr;
66 if (!objmap) {
67 return 0;
68 }
69
70 if (objmap->ht) {
71 return xmlHashSize(objmap->ht);
72 }
73
74 if (objmap->nodetype == DOM_NODESET) {
75 HashTable *nodeht = HASH_OF(&objmap->baseobj_zv);
76 return zend_hash_num_elements(nodeht);
77 }
78
79 xmlNodePtr nodep = dom_object_get_node(objmap->baseobj);
80 if (!nodep) {
81 return 0;
82 }
83
84 if (!php_dom_is_cache_tag_stale_from_node(&objmap->cache_tag, nodep)) {
85 if (objmap->cached_length >= 0) {
86 return objmap->cached_length;
87 }
88 /* Only the length is out-of-date, the cache tag is still valid.
89 * Therefore, only overwrite the length and keep the currently cached object. */
90 } else {
91 php_dom_mark_cache_tag_up_to_date_from_node(&objmap->cache_tag, nodep);
92 reset_objmap_cache(objmap);
93 }
94
95 int count = 0;
96 if (objmap->nodetype == XML_ATTRIBUTE_NODE || objmap->nodetype == XML_ELEMENT_NODE) {
97 xmlNodePtr curnode = dom_nodelist_iter_start_first_child(nodep);
98 if (curnode) {
99 count++;
100 while (curnode->next != NULL) {
101 count++;
102 curnode = curnode->next;
103 }
104 }
105 } else {
106 xmlNodePtr basep = nodep;
107 nodep = php_dom_first_child_of_container_node(basep);
108 dom_get_elements_by_tag_name_ns_raw(
109 basep, nodep, objmap->ns, objmap->local, objmap->local_lower, &count, INT_MAX - 1 /* because of <= */);
110 }
111
112 objmap->cached_length = count;
113
114 return count;
115 }
116
117 /* {{{ length int
118 readonly=yes
119 URL: http://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030226/DOM3-Core.html#ID-203510337
120 Since:
121 */
dom_nodelist_length_read(dom_object * obj,zval * retval)122 zend_result dom_nodelist_length_read(dom_object *obj, zval *retval)
123 {
124 ZVAL_LONG(retval, php_dom_get_nodelist_length(obj));
125 return SUCCESS;
126 }
127 /* }}} */
128
129 /* {{{ */
PHP_METHOD(DOMNodeList,count)130 PHP_METHOD(DOMNodeList, count)
131 {
132 ZEND_PARSE_PARAMETERS_NONE();
133 dom_object *intern = Z_DOMOBJ_P(ZEND_THIS);
134 RETURN_LONG(php_dom_get_nodelist_length(intern));
135 }
136 /* }}} end dom_nodelist_count */
137
php_dom_nodelist_get_item_into_zval(dom_nnodemap_object * objmap,zend_long index,zval * return_value)138 void php_dom_nodelist_get_item_into_zval(dom_nnodemap_object *objmap, zend_long index, zval *return_value)
139 {
140 xmlNodePtr itemnode = NULL;
141 bool cache_itemnode = false;
142 if (index >= 0) {
143 if (objmap != NULL) {
144 if (objmap->ht) {
145 itemnode = php_dom_libxml_hash_iter(objmap, index);
146 } else {
147 if (objmap->nodetype == DOM_NODESET) {
148 HashTable *nodeht = HASH_OF(&objmap->baseobj_zv);
149 zval *entry = zend_hash_index_find(nodeht, index);
150 if (entry) {
151 ZVAL_COPY(return_value, entry);
152 return;
153 }
154 } else if (objmap->baseobj) {
155 xmlNodePtr basep = dom_object_get_node(objmap->baseobj);
156 if (basep) {
157 xmlNodePtr nodep = basep;
158 /* For now we're only able to use cache for forward search.
159 * TODO: in the future we could extend the logic of the node list such that backwards searches
160 * are also possible. */
161 bool restart = true;
162 int relative_index = index;
163 if (index >= objmap->cached_obj_index && objmap->cached_obj && !php_dom_is_cache_tag_stale_from_node(&objmap->cache_tag, nodep)) {
164 xmlNodePtr cached_obj_xml_node = dom_object_get_node(objmap->cached_obj);
165
166 /* The node cannot be NULL if the cache is valid. If it is NULL, then it means we
167 * forgot an invalidation somewhere. Take the defensive programming approach and invalidate
168 * it here if it's NULL (except in debug mode where we would want to catch this). */
169 if (UNEXPECTED(cached_obj_xml_node == NULL)) {
170 #if ZEND_DEBUG
171 ZEND_UNREACHABLE();
172 #endif
173 reset_objmap_cache(objmap);
174 } else {
175 restart = false;
176 relative_index -= objmap->cached_obj_index;
177 nodep = cached_obj_xml_node;
178 }
179 }
180 int count = 0;
181 if (objmap->nodetype == XML_ATTRIBUTE_NODE || objmap->nodetype == XML_ELEMENT_NODE) {
182 if (restart) {
183 nodep = dom_nodelist_iter_start_first_child(nodep);
184 }
185 while (count < relative_index && nodep != NULL) {
186 count++;
187 nodep = nodep->next;
188 }
189 itemnode = nodep;
190 } else {
191 if (restart) {
192 nodep = php_dom_first_child_of_container_node(basep);
193 }
194 itemnode = dom_get_elements_by_tag_name_ns_raw(basep, nodep, objmap->ns, objmap->local, objmap->local_lower, &count, relative_index);
195 }
196 cache_itemnode = true;
197 }
198 }
199 }
200 }
201
202 if (itemnode) {
203 DOM_RET_OBJ(itemnode, objmap->baseobj);
204 if (cache_itemnode) {
205 /* Hold additional reference for the cache, must happen before releasing the cache
206 * because we might be the last reference holder.
207 * Instead of storing and copying zvals, we store the object pointer directly.
208 * This saves us some bytes because a pointer is smaller than a zval.
209 * This also means we have to manually refcount the objects here, and remove the reference count
210 * in reset_objmap_cache() and the destructor. */
211 dom_object *cached_obj = Z_DOMOBJ_P(return_value);
212 GC_ADDREF(&cached_obj->std);
213 /* If the tag is stale, all cached data is useless. Otherwise only the cached object is useless. */
214 if (php_dom_is_cache_tag_stale_from_node(&objmap->cache_tag, itemnode)) {
215 php_dom_mark_cache_tag_up_to_date_from_node(&objmap->cache_tag, itemnode);
216 reset_objmap_cache(objmap);
217 } else {
218 objmap_cache_release_cached_obj(objmap);
219 }
220 objmap->cached_obj_index = index;
221 objmap->cached_obj = cached_obj;
222 }
223 return;
224 }
225 }
226
227 RETVAL_NULL();
228 }
229
230 /* {{{ URL: http://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030226/DOM3-Core.html#ID-844377136
231 Since:
232 */
PHP_METHOD(DOMNodeList,item)233 PHP_METHOD(DOMNodeList, item)
234 {
235 zend_long index;
236 ZEND_PARSE_PARAMETERS_START(1, 1)
237 Z_PARAM_LONG(index)
238 ZEND_PARSE_PARAMETERS_END();
239
240 zval *id = ZEND_THIS;
241 dom_object *intern = Z_DOMOBJ_P(id);
242 dom_nnodemap_object *objmap = intern->ptr;
243 php_dom_nodelist_get_item_into_zval(objmap, index, return_value);
244 }
245 /* }}} end dom_nodelist_item */
246
ZEND_METHOD(DOMNodeList,getIterator)247 ZEND_METHOD(DOMNodeList, getIterator)
248 {
249 ZEND_PARSE_PARAMETERS_NONE();
250 zend_create_internal_iterator_zval(return_value, ZEND_THIS);
251 }
252
dom_modern_nodelist_get_index(const zval * offset)253 dom_nodelist_dimension_index dom_modern_nodelist_get_index(const zval *offset)
254 {
255 dom_nodelist_dimension_index ret;
256
257 ZVAL_DEREF(offset);
258
259 if (Z_TYPE_P(offset) == IS_LONG) {
260 ret.type = DOM_NODELIST_DIM_LONG;
261 ret.lval = Z_LVAL_P(offset);
262 } else if (Z_TYPE_P(offset) == IS_DOUBLE) {
263 ret.type = DOM_NODELIST_DIM_LONG;
264 ret.lval = zend_dval_to_lval_safe(Z_DVAL_P(offset));
265 } else if (Z_TYPE_P(offset) == IS_STRING) {
266 zend_ulong lval;
267 if (ZEND_HANDLE_NUMERIC(Z_STR_P(offset), lval)) {
268 ret.type = DOM_NODELIST_DIM_LONG;
269 ret.lval = (zend_long) lval;
270 } else {
271 ret.type = DOM_NODELIST_DIM_STRING;
272 ret.str = Z_STR_P(offset);
273 }
274 } else {
275 ret.type = DOM_NODELIST_DIM_ILLEGAL;
276 }
277
278 return ret;
279 }
280
dom_modern_nodelist_read_dimension(zend_object * object,zval * offset,int type,zval * rv)281 zval *dom_modern_nodelist_read_dimension(zend_object *object, zval *offset, int type, zval *rv)
282 {
283 if (UNEXPECTED(!offset)) {
284 zend_throw_error(NULL, "Cannot append to %s", ZSTR_VAL(object->ce->name));
285 return NULL;
286 }
287
288 dom_nodelist_dimension_index index = dom_modern_nodelist_get_index(offset);
289 if (UNEXPECTED(index.type == DOM_NODELIST_DIM_ILLEGAL || index.type == DOM_NODELIST_DIM_STRING)) {
290 zend_illegal_container_offset(object->ce->name, offset, type);
291 return NULL;
292 }
293
294 php_dom_nodelist_get_item_into_zval(php_dom_obj_from_obj(object)->ptr, index.lval, rv);
295 return rv;
296 }
297
dom_modern_nodelist_has_dimension(zend_object * object,zval * member,int check_empty)298 int dom_modern_nodelist_has_dimension(zend_object *object, zval *member, int check_empty)
299 {
300 /* If it exists, it cannot be empty because nodes aren't empty. */
301 ZEND_IGNORE_VALUE(check_empty);
302
303 dom_nodelist_dimension_index index = dom_modern_nodelist_get_index(member);
304 if (UNEXPECTED(index.type == DOM_NODELIST_DIM_ILLEGAL || index.type == DOM_NODELIST_DIM_STRING)) {
305 zend_illegal_container_offset(object->ce->name, member, BP_VAR_IS);
306 return 0;
307 }
308
309 return index.lval >= 0 && index.lval < php_dom_get_nodelist_length(php_dom_obj_from_obj(object));
310 }
311
312 #endif
313
